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Fox

Weird quite deep rumbling noise coming from my Ultegra rear mech, apparently from the jockey wheels. I've got a KMC X11 SL chain and as the chain goes over the jockey wheels it seems a bit lumpy, specifically as it passes round the upper jockey wheel.

If I turn the pedal with my hand as the bike's on the stand I can feel the rumbling through the pedal. This bike/groupset were new only about 1300 miles ago and it's just not smooth like it should be.

What's going on please?

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Dammit in reply to @Fox

My Serotta did this- the jockey wheels had frozen, the chain was running over them rather than around them

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Fox in reply to @Dammit

Frozen as in wouldn't turn at all or do you not mean literally frozen?

Mine seem to be turning fine but it's almost like the chain doesn't fit onto them properly, or at least onto the top one. But they used to be fine and KMC chains are meant to be smooth!

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